—Can you spell it, please?—________. A. B-O-O-K, kook B. Yes. B-O-O-K, kook C. No, I’m not
We must have the machine ____.
He didn’t enjoy the play because he ____.
The dog ____ mad(疯的).
I think _____necessary(必要的) to learn English well.
____ were all very tired, but none of ____ would stop to take a rest.